I want to benchmark write speeds on a disk in an existing server setup. I suspect there is a problem with the write perf of the controller. Benchmarks I have tried (SiSoft Sandra, HDTune) report that write testing cannot be performed since the disk has partitions.
How can I do a write speed benchmark for disk that isn't empty? I don't mind if it is a rudimentary test, but something a bit better than me using a stopwatch and copying a file has to be possible?